Mobile communication system and base station control apparatus

Abstract

A neighbor sector is automatically set to effectively perform soft handover. A base station corresponding to a first sector to communicate with a wireless terminal and a base station corresponding to a second sector to start communication with the wireless terminal due to movement of the wireless terminal or the like transmit a terminal identifier acquired from the wireless terminal, a time and a sector identifier to a base station control part (control part in the following). The control part successively stores the received sector identifier into a table correspondingly to the terminal identifier and the time received from the base station. Besides, the control part refers to the table, judges whether different sector identifiers are stored in a previously determined time range, regards a pair of the two different sector identifiers as neighbor sector candidates and counts the number of times they are regarded as the neighbor sector candidates. With respect to the neighbor sector candidates in which the counted number of times is a threshold or more, the control part transmits, to the base station corresponding to one sector of the neighbor sector candidates, a change request including the neighbor sector information concerning the other sector.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a mobile communication system and a wireless base station control apparatus, and particularly to a mobile communication system and a wireless base station control apparatus for managing an adjacent relation of wireless base stations in a mobile communication system where plural wireless terminals simultaneously communicate with one sector and one wireless terminal can receive signals of plural sectors and / or in a mobile communication system where communication is performed by the code division multiple access (CDMA) system in each sector of each base station.[0002]The basis of cellular communication is that a wireless terminal, such as, for example, an in-vehicle telephone or a cellular phone, finds a radio wave from a sector of a nearby base station and exchanges a radio wave between the wireless terminal and the base station. A communicable area in which a radio wave from one of antennas provided in a base station c...

AI Technical Summary

Benefits of technology

"The invention provides a mobile communication system and a wireless base station control apparatus that can effectively perform soft handover between sectors of a base station without causing interruption or a short suspension period. The system automatically collects and sets neighbor sector information by tracking the communication history of a wireless terminal and the sectors of a base station. The base station control part can change the neighbor sector information based on the captured radio wave information of the wireless terminal. The invention reduces the operation cost by eliminating the need for simulation, radio wave measurement, and changes to the base station parameters when the network or the environment changes. The invention also provides a mobile communication network that can effectively handle changes in the arrangement of base stations or the addition of new base stations without incurring excessive costs."

Problems solved by technology

However, in the case where a wireless terminal is moved into a sector of an adjacent base station while the wireless terminal is in a state where it can not receive radio waves of plural sectors, the handover is accompanied by an instantaneous interruption or a short suspension period.

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